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inflate.c
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1 /* inflate.c -- zlib interface to inflate modules
2  * Copyright (C) 1995-2002 Mark Adler
3  * For conditions of distribution and use, see copyright notice in zlib.h
4  */
5 
6 #include "zutil.h"
7 #include "infblock.h"
8 
9 #define DONE INFLATE_DONE
10 #define BAD INFLATE_BAD
11 
12 typedef enum {
13  METHOD, /* waiting for method byte */
14  FLAG, /* waiting for flag byte */
15  DICT4, /* four dictionary check bytes to go */
16  DICT3, /* three dictionary check bytes to go */
17  DICT2, /* two dictionary check bytes to go */
18  DICT1, /* one dictionary check byte to go */
19  DICT0, /* waiting for inflateSetDictionary */
20  BLOCKS, /* decompressing blocks */
21  CHECK4, /* four check bytes to go */
22  CHECK3, /* three check bytes to go */
23  CHECK2, /* two check bytes to go */
24  CHECK1, /* one check byte to go */
25  DONE, /* finished check, done */
26  BAD} /* got an error--stay here */
28 
29 /* inflate private state */
31 
32  /* mode */
33  inflate_mode mode; /* current inflate mode */
34 
35  /* mode dependent information */
36  union {
37  uInt method; /* if FLAGS, method byte */
38  struct {
39  uLong was; /* computed check value */
40  uLong need; /* stream check value */
41  } check; /* if CHECK, check values to compare */
42  uInt marker; /* if BAD, inflateSync's marker bytes count */
43  } sub; /* submode */
44 
45  /* mode independent information */
46  int nowrap; /* flag for no wrapper */
47  uInt wbits; /* log2(window size) (8..15, defaults to 15) */
49  *blocks; /* current inflate_blocks state */
50 
51 };
52 
53 
54 ZEXPORT(int) inflateReset( /* z) */
55 z_streamp z )
56 {
57  if (z == Z_NULL || z->state == Z_NULL)
58  return Z_STREAM_ERROR;
59  z->total_in = z->total_out = 0;
60  z->msg = Z_NULL;
61  z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
62  inflate_blocks_reset(z->state->blocks, z, Z_NULL);
63  Tracev((stderr, "inflate: reset\n"));
64  return Z_OK;
65 }
66 
67 
68 ZEXPORT(int) inflateEnd( /* z) */
69 z_streamp z )
70 {
71  if (z == Z_NULL || z->state == Z_NULL || z->zfree == Z_NULL)
72  return Z_STREAM_ERROR;
73  if (z->state->blocks != Z_NULL)
74  inflate_blocks_free(z->state->blocks, z);
75  ZFREE(z, z->state);
76  z->state = Z_NULL;
77  Tracev((stderr, "inflate: end\n"));
78  return Z_OK;
79 }
80 
81 
82 ZEXPORT(int) inflateInit2_( /* z, w, version, stream_size) */
83 z_streamp z,
84 int w,
85 const char *version,
86 int stream_size )
87 {
88  if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
89  stream_size != sizeof(z_stream))
90  return Z_VERSION_ERROR;
91 
92  /* initialize state */
93  if (z == Z_NULL)
94  return Z_STREAM_ERROR;
95  z->msg = Z_NULL;
96  if (z->zalloc == Z_NULL)
97  {
98  z->zalloc = zcalloc;
99  z->opaque = (voidpf)0;
100  }
101  if (z->zfree == Z_NULL) z->zfree = zcfree;
102  if ((z->state = (struct internal_state FAR *)
103  ZALLOC(z,1,sizeof(struct internal_state))) == Z_NULL)
104  return Z_MEM_ERROR;
105  z->state->blocks = Z_NULL;
106 
107  /* handle undocumented nowrap option (no zlib header or check) */
108  z->state->nowrap = 0;
109  if (w < 0)
110  {
111  w = - w;
112  z->state->nowrap = 1;
113  }
114 
115  /* set window size */
116  if (w < 8 || w > 15)
117  {
118  inflateEnd(z);
119  return Z_STREAM_ERROR;
120  }
121  z->state->wbits = (uInt)w;
122 
123  /* create inflate_blocks state */
124  if ((z->state->blocks =
125  inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, (uInt)1 << w))
126  == Z_NULL)
127  {
128  inflateEnd(z);
129  return Z_MEM_ERROR;
130  }
131  Tracev((stderr, "inflate: allocated\n"));
132 
133  /* reset state */
134  inflateReset(z);
135  return Z_OK;
136 }
137 
138 
139 
140 #undef NEEDBYTE
141 #define NEEDBYTE {if(z->avail_in==0)return r;r=f;}
142 
143 #undef NEXTBYTE
144 #define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
145 
146 
147 ZEXPORT(int) inflate( /* z, f) */
148 z_streamp z,
149 int f )
150 {
151  int r;
152  uInt b;
153 
154  if (z == Z_NULL || z->state == Z_NULL || z->next_in == Z_NULL)
155  return Z_STREAM_ERROR;
156  f = f == Z_FINISH ? Z_BUF_ERROR : Z_OK;
157  r = Z_BUF_ERROR;
158  while (1) switch (z->state->mode)
159  {
160  case METHOD:
161  NEEDBYTE
162  if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED)
163  {
164  z->state->mode = BAD;
165  z->msg = (char*)"unknown compression method";
166  z->state->sub.marker = 5; /* can't try inflateSync */
167  break;
168  }
169  if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
170  {
171  z->state->mode = BAD;
172  z->msg = (char*)"invalid window size";
173  z->state->sub.marker = 5; /* can't try inflateSync */
174  break;
175  }
176  z->state->mode = FLAG;
177  case FLAG:
178  NEEDBYTE
179  b = NEXTBYTE;
180  if (((z->state->sub.method << 8) + b) % 31)
181  {
182  z->state->mode = BAD;
183  z->msg = (char*)"incorrect header check";
184  z->state->sub.marker = 5; /* can't try inflateSync */
185  break;
186  }
187  Tracev((stderr, "inflate: zlib header ok\n"));
188  if (!(b & PRESET_DICT))
189  {
190  z->state->mode = BLOCKS;
191  break;
192  }
193  z->state->mode = DICT4;
194  case DICT4:
195  NEEDBYTE
196  z->state->sub.check.need = (uLong)NEXTBYTE << 24;
197  z->state->mode = DICT3;
198  case DICT3:
199  NEEDBYTE
200  z->state->sub.check.need += (uLong)NEXTBYTE << 16;
201  z->state->mode = DICT2;
202  case DICT2:
203  NEEDBYTE
204  z->state->sub.check.need += (uLong)NEXTBYTE << 8;
205  z->state->mode = DICT1;
206  case DICT1:
207  NEEDBYTE
208  z->state->sub.check.need += (uLong)NEXTBYTE;
209  z->adler = z->state->sub.check.need;
210  z->state->mode = DICT0;
211  return Z_NEED_DICT;
212  case DICT0:
213  z->state->mode = BAD;
214  z->msg = (char*)"need dictionary";
215  z->state->sub.marker = 0; /* can try inflateSync */
216  return Z_STREAM_ERROR;
217  case BLOCKS:
218  r = inflate_blocks(z->state->blocks, z, r);
219  if (r == Z_DATA_ERROR)
220  {
221  z->state->mode = BAD;
222  z->state->sub.marker = 0; /* can try inflateSync */
223  break;
224  }
225  if (r == Z_OK)
226  r = f;
227  if (r != Z_STREAM_END)
228  return r;
229  r = f;
230  inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
231  if (z->state->nowrap)
232  {
233  z->state->mode = DONE;
234  break;
235  }
236  z->state->mode = CHECK4;
237  case CHECK4:
238  NEEDBYTE
239  z->state->sub.check.need = (uLong)NEXTBYTE << 24;
240  z->state->mode = CHECK3;
241  case CHECK3:
242  NEEDBYTE
243  z->state->sub.check.need += (uLong)NEXTBYTE << 16;
244  z->state->mode = CHECK2;
245  case CHECK2:
246  NEEDBYTE
247  z->state->sub.check.need += (uLong)NEXTBYTE << 8;
248  z->state->mode = CHECK1;
249  case CHECK1:
250  NEEDBYTE
251  z->state->sub.check.need += (uLong)NEXTBYTE;
252 
253  if (z->state->sub.check.was != z->state->sub.check.need)
254  {
255  z->state->mode = BAD;
256  z->msg = (char*)"incorrect data check";
257  z->state->sub.marker = 5; /* can't try inflateSync */
258  break;
259  }
260  Tracev((stderr, "inflate: zlib check ok\n"));
261  z->state->mode = DONE;
262  case DONE:
263  return Z_STREAM_END;
264  case BAD:
265  return Z_DATA_ERROR;
266  default:
267  return Z_STREAM_ERROR;
268  }
269 #ifdef NEED_DUMMY_RETURN
270  return Z_STREAM_ERROR; /* Some dumb compilers complain without this */
271 #endif
272 }
273 
Definition: inflate.c:23
inflate_mode
Definition: inflate.c:12
GLubyte GLubyte GLubyte GLubyte w
Definition: glext.h:6102
struct inflate_blocks_state FAR inflate_blocks_statef
Definition: infblock.h:15
GLdouble GLdouble GLdouble r
Definition: gl.h:2055
#define ZALLOC(strm, items, size)
Definition: zutil.h:210
#define NEXTBYTE
Definition: inflate.c:144
#define PRESET_DICT
Definition: zutil.h:68
int ZEXPORT inflateEnd(z_streamp strm)
Definition: inflate.c:1277
#define DONE
Definition: inflate.c:9
struct internal_state::@3846::@3847 check
#define Z_NEED_DICT
Definition: zlib.h:179
#define Z_STREAM_ERROR
Definition: zlib.h:181
Definition: inflate.c:21
#define Z_STREAM_END
Definition: zlib.h:178
inflate_blocks_statef * inflate_blocks_new(z_streamp z, check_func c, uInt w)
Definition: infblock.c:88
#define Z_BUF_ERROR
Definition: zlib.h:184
z_stream FAR * z_streamp
Definition: zlib.h:108
Definition: inflate.c:15
#define FAR
Definition: guiddef.h:36
#define Z_OK
Definition: zlib.h:177
#define ZLIB_VERSION
Definition: zlib.h:40
inflate_mode mode
Definition: inflate.c:33
GLdouble GLdouble z
Definition: glext.h:5874
Definition: inflate.c:18
uInt wbits
Definition: inflate.c:47
static const WCHAR version[]
Definition: asmname.c:64
int inflate_blocks_free(inflate_blocks_statef *s, z_streamp z)
Definition: infblock.c:375
#define Z_DEFLATED
Definition: zlib.h:209
int const char int stream_size
Definition: zlib.h:813
Definition: inflate.c:22
uLong need
Definition: inflate.c:40
#define b
Definition: ke_i.h:79
#define BAD
Definition: inflate.c:10
unsigned long uLong
Definition: zconf.h:394
GLfloat f
Definition: glext.h:7540
GLboolean GLboolean GLboolean b
Definition: glext.h:6204
inflate_blocks_statef * blocks
Definition: inflate.c:49
#define ZFREE(strm, addr)
Definition: zutil.h:212
#define Z_DATA_ERROR
Definition: zlib.h:182
int inflate_blocks(inflate_blocks_statef *s, z_streamp z, int r)
Definition: infblock.c:119
int ZEXPORT inflate(z_streamp strm, int flush)
Definition: inflate.c:622
#define NEEDBYTE
Definition: inflate.c:141
Definition: inflate.c:17
uInt method
Definition: inflate.c:37
int ZEXPORT inflateInit2_(z_streamp strm, int windowBits, const char *version, int stream_size)
Definition: inflate.c:195
int ZEXPORT inflateReset(z_streamp strm)
Definition: inflate.c:144
Definition: inflate.c:13
Byte FAR * voidpf
Definition: zconf.h:413
#define Z_FINISH
Definition: zlib.h:172
#define Tracev(x)
Definition: zutil.h:198
#define Z_VERSION_ERROR
Definition: zlib.h:185
void zcfree(voidpf opaque, voidpf ptr)
Definition: zutil.c:173
Definition: inflate.c:19
uInt marker
Definition: inflate.c:42
#define f
Definition: ke_i.h:83
Definition: inflate.c:24
voidpf zcalloc(voidpf opaque, unsigned items, unsigned size)
Definition: zutil.c:164
Definition: inflate.c:20
union internal_state::@3846 sub
Definition: inflate.c:16
FILE * stderr
Definition: inflate.c:14
void inflate_blocks_reset(inflate_blocks_statef *s, z_streamp z, uLongf *c)
Definition: infblock.c:67
#define Z_NULL
Definition: zlib.h:212
ZEXPORT(int)
Definition: inflate.c:54
uLong ZEXPORT adler32(uLong adler, const Bytef *buf, uInt len)
Definition: adler32.c:134
#define Z_MEM_ERROR
Definition: zlib.h:183
unsigned int uInt
Definition: zconf.h:393
uLong was
Definition: inflate.c:39